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Financial Instruments - Additional Information (Detail) - Toledo Spirit time-charter derivative [Member] - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Average daily tanker rate over remaining duration of charter contract $ 34,093 $ 27,554
Discount rate over remaining duration of contract 7.50% 7.40%